// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: http://codemirror.net/LICENSE

(function(mod) {
    if (typeof exports == "object" && typeof module == "object") // CommonJS
        mod(require("../../lib/codemirror"));
    else if (typeof define == "function" && define.amd) // AMD
        define(["../../lib/codemirror"], mod);
    else // Plain browser env
        mod(CodeMirror);
})(function(CodeMirror) {
    "use strict";

    CodeMirror.defineMode('shell', function() {

        var words = {};
        function define(style, string) {
            var split = string.split(' ');
            for(var i = 0; i < split.length; i++) {
                words[split[i]] = style;
            }
        };

        // Atoms
        define('atom', 'true false');

        // Keywords
        define('keyword', 'if then do else elif while until for in esac fi fin ' +
            'fil done exit set unset export function');

        // Commands
        define('builtin', 'ab awk bash beep cat cc cd chown chmod chroot clear cp ' +
            'curl cut diff echo find gawk gcc get git grep kill killall ln ls make ' +
            'mkdir openssl mv nc node npm ping ps restart rm rmdir sed service sh ' +
            'shopt shred source sort sleep ssh start stop su sudo tee telnet top ' +
            'touch vi vim wall wc wget who write yes zsh');

        function tokenBase(stream, state) {
            if (stream.eatSpace()) return null;

            var sol = stream.sol();
            var ch = stream.next();

            if (ch === '\\') {
                stream.next();
                return null;
            }
            if (ch === '\'' || ch === '"' || ch === '`') {
                state.tokens.unshift(tokenString(ch, ch === "`" ? "quote" : "string"));
                return tokenize(stream, state);
            }
            if (ch === '#') {
                if (sol && stream.eat('!')) {
                    stream.skipToEnd();
                    return 'meta'; // 'comment'?
                }
                stream.skipToEnd();
                return 'comment';
            }
            if (ch === '$') {
                state.tokens.unshift(tokenDollar);
                return tokenize(stream, state);
            }
            if (ch === '+' || ch === '=') {
                return 'operator';
            }
            if (ch === '-') {
                stream.eat('-');
                stream.eatWhile(/\w/);
                return 'attribute';
            }
            if (/\d/.test(ch)) {
                stream.eatWhile(/\d/);
                if(stream.eol() || !/\w/.test(stream.peek())) {
                    return 'number';
                }
            }
            stream.eatWhile(/[\w-]/);
            var cur = stream.current();
            if (stream.peek() === '=' && /\w+/.test(cur)) return 'def';
            return words.hasOwnProperty(cur) ? words[cur] : null;
        }

        function tokenString(quote, style) {
            var close = quote == "(" ? ")" : quote
            return function(stream, state) {
                var next, end = false, escaped = false;
                while ((next = stream.next()) != null) {
                    if (next === close && !escaped) {
                        end = true;
                        break;
                    }
                    if (next === '$' && !escaped && quote !== "'") {
                        escaped = true;
                        stream.backUp(1);
                        state.tokens.unshift(tokenDollar);
                        break;
                    }
                    if (next === "(" && quote === "(") {
                        state.tokens.unshift(tokenString(quote, style))
                        return tokenize(stream, state)
                    }
                    escaped = !escaped && next === '\\';
                }
                if (end || !escaped) state.tokens.shift();
                return style;
            };
        };

        var tokenDollar = function(stream, state) {
            if (state.tokens.length > 1) stream.eat('$');
            var ch = stream.next(), hungry = /\w/;
            if (ch === '{') hungry = /[^}]/;
            if (/['"(]/.test(ch)) {
                state.tokens[0] = tokenString(ch, ch == "(" ? "quote" : "string");
                return tokenize(stream, state);
            }
            if (!/\d/.test(ch)) {
                stream.eatWhile(hungry);
                stream.eat('}');
            }
            state.tokens.shift();
            return 'def';
        };

        function tokenize(stream, state) {
            return (state.tokens[0] || tokenBase) (stream, state);
        };

        return {
            startState: function() {return {tokens:[]};},
            token: function(stream, state) {
                return tokenize(stream, state);
            },
            closeBrackets: "()[]{}''\"\"``",
            lineComment: '#',
            fold: "brace"
        };
    });

    CodeMirror.defineMIME('text/x-sh', 'shell');

});